Polonium (Po)

Polonium is a chemical element with symbol Po and atomic number 84, discovered in 1898 by Marie Curie and Pierre Curie. A rare and highly radioactive element with no stable isotopes, polonium is chemically similar to bismuth and tellurium.

Atomic Number

84

Atomic Mass

209 u

Category

post transition

Phase

solid

Density

9.196 g/cm³

Electron Shells

2, 8, 18, 32, 18, 6

Atomic Structure

Protons: 84 • Electrons: 84 • Neutrons: Varies by isotope

Electron Configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁴

Discovery

1898 • Marie Curie, Pierre Curie